# US 10,319,490 B2 · Conductive elastomer composition and molded article of the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,490 B2 - Document ID: US10319490B2 - Status: Granted - Kind: B2 - Application number: 15/282,182 - Filed: 2016-09-30 - Published: 2017-04-06 - Granted: 2019-06-11 - Earliest claimed: 2015-10-02 - Assignees: Hitachi Metals, Ltd. - Applicants: Hitachi Metals, Ltd. - Inventors: Keisuke Sugita; Akinari Nakayama - Web page: https://patentgrep.com/patent/US10319490B2 ## CPC - H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon - C08K 3/04: Carbon - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - C08L 53/025: {modified} - C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof - C08L 2203/20: use in electrical or conductive gadgets - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract There is provided an elastomer composition having both of a flexibility and a wear resistance at a low temperature, while having a high conductivity, and containing an elastomer component (A) including styrene-based thermoplastic elastomer (a1) and propylene-based elastomer (a2); and containing 10 pts.mass or more and 100 pts.mass or less of a conductivity imparting agent (B), and 10 pts.mass or more and 300 pts.mass of less of a process oil (C) based on 100 pts.mass of the elastomer component (A). ## Claims ### Claim 1 An elastomer composition, comprising: an elastomer component (A) consisting of styrene-based thermoplastic elastomer (a1) and propylene-based elastomer (a2); a conductivity imparting agent (B) contained in an amount of 10 pts.mass or more and 100 pts.mass or less based on 100 pts.mass of the elastomer component (A); and a process oil (C) contained in an amount of 10 pts.mass or more and 300 pts.mass or less based on 100 pts.mass of the elastomer component (A), wherein only the elastomer component (A) is contained as a polymer component, and wherein the styrene-based thermoplastic elastomer (a1) consists of a styrene-ethylene-ethylene-propylene-styrene block copolymer. ### Claim 2 (depends on 1) The elastomer composition according to claim 1, wherein the propylene-based elastomer (a2) has a crystal fusion heat of 25 J/g or less as determined by differential scanning calorimetry. ### Claim 3 (depends on 1) The elastomer composition according to claim 1, wherein the propylene-based elastomer (a2) has a glass transition temperature of −5° C. or less. ### Claim 4 (depends on 1) The elastomer composition according to claim 1, wherein the elastomer component (A) contains the styrene-based thermoplastic elastomer (a1) and the propylene-based elastomer (a2) at a mass ratio in a range of 10:90 to 90:10. ### Claim 5 (depends on 1) The elastomer composition according to claim 1, wherein the elastomer component (A) contains the styrene-based thermoplastic elastomer (a1) and the propylene-based elastomer (a2) at a mass ratio in a range of 30:70 to 80:20. ### Claim 6 (depends on 1) The elastomer composition according to claim 1, wherein the conductivity imparting agent (B) is contained in an amount of 20 pts.mass or more and 80 pts.mass or less based on 100 pts.mass of the elastomer component (A). ### Claim 7 (depends on 1) The elastomer composition according to claim 1, wherein the propylene-based elastomer (a2) includes a copolymer having a segment composed of propylene, and a segment composed of α-olefin. ### Claim 8 (depends on 1) The elastomer composition according to claim 1, wherein the amount of the conductivity imparting agent (B) is in a range from 20 pts.mass to 80 pts.mass based on 100 pts.mass of the elastomer component (A). ### Claim 9 (depends on 1) The elastomer composition according to claim 1, wherein the conductivity imparting agent (B) comprises carbon black. ### Claim 10 (depends on 1) The elastomer composition according to claim 1, wherein the conductivity imparting agent (B) comprises Ketjen black. ### Claim 11 (depends on 1) The elastomer composition according to claim 1, wherein the amount of the process oil (C) is in a range from 20 pts.mass to 200 pts.mass based on 100 pts.mass of the elastomer component (A). ### Claim 12 A molded article composed of an elastomer composition, the elastomer composition comprising: an elastomer component (A) consisting of styrene-based thermoplastic elastomer (a1) and propylene-based elastomer (a2); a conductivity imparting agent (B) contained in an amount of 10 pts.mass or more and 100 pts.mass or less based on 100 pts.mass of the elastomer component (A); and a process oil (C) contained in an amount of 10 pts.mass or more and 300 pts.mass or less based on 100 pts.mass of the elastomer component (A), wherein only the elastomer component (A) is contained as a polymer component, and wherein the stryene-based thermoplastic elastomer (a1) consists of a styrene-ethylene-ethylene-propylene-styrene block copolymer. ### Claim 13 (depends on 12) The molded article according to claim 12, wherein a storage elastic modulus at −10° C. is 500 MPa or less, and a volume resistivity is 1 Ω·cm or less. ### Claim 14 (depends on 12) The molded article according to claim 12, wherein the elastomer composition is formed by dynamic crosslinking, and a crosslinked structure is introduced to the styrene-based thermoplastic elastomer (a1). ### Claim 15 (depends on 12) The molded article according to claim 12, is formed into a sheet shape, and is formed as at least one of an electromagnetic shielding, an anti-static material, and a pressure-sensitive switch electrode. ### Claim 16 (depends on 12) The molded article according to claim 12, wherein the amount of the conductivity imparting agent (B) is in a range from 20 pts.mass to 80 pts.mass based on 100 pts.mass of the elastomer component (A). ### Claim 17 (depends on 12) The molded article according to claim 12, wherein the conductivity imparting agent (B) comprises carbon black. ### Claim 18 (depends on 12) The molded article according to claim 12, wherein the conductivity imparting agent (B) comprises Ketjen black. ### Claim 19 (depends on 12) The molded article according to claim 12, wherein the amount of the process oil (C) is in a range from 20 pts.mass to 200 pts.mass based on 100 pts.mass of the elastomer component (A).